EN 62491:2008

SLOVENSKI STANDARD
01-november-2008
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Industrial systems, installations and equipment and industrial products - Labelling of
cables and cores (IEC 62491:2008)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Beschriftung
von Kabeln / Leitungen und Adern (IEC 62491:2008)
Systemes, installations, appareils et produits industriels - Marquage des câbles et des
conducteurs isolés (CEI 62491:2008)
Ta slovenski standard je istoveten z: EN 62491:2008
ICS:
01.110 7HKQLþQDGRNXPHQWDFLMD]D Technical product
L]GHONH documentation
29.060.01 (OHNWULþQHåLFHLQNDEOLQD Electrical wires and cables in
VSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62491
NORME EUROPÉENNE
September 2008
EUROPÄISCHE NORM
ICS 01.110; 29.020.20
English version
Industrial systems, installations and equipment
and industrial products -
Labelling of cables and cores
(IEC 62491:2008)
Systèmes industriels, installations  Industrielle Systeme, Anlagen
et appareils et produits industriels - und Ausrüstungen und Industrieprodukte -
Etiquetage des câbles et Beschriftung von Kabeln / Leitungen
des conducteurs isolés und Adern
(CEI 62491:2008) (IEC 62491:2008)

This European Standard was approved by CENELEC on 2008-07-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62491:2008 E
Foreword
The text of document 3/849/CDV, future edition 1 of IEC 62491, prepared by IEC TC 3, Information
structures, documentation and graphical symbols, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 62491 on 2008-07-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62491:2008 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60446 NOTE  Harmonized as EN 60446:2007 (not modified).
__________
- 3 - EN 62491:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60445 (mod) - Basic and safety principles for man-machine EN 60445 2007
interface, marking and identification -
Identification of equipment terminals and
conductor terminations
1) 2)
IEC 60757 - Code for designation of colours HD 457 S1 1985

IEC 61082-1 2006 Preparation of documents used in EN 61082-1 2006
electrotechnology -
Part 1: Rules
1) 2)
IEC 61175 - Industrial systems, installations and EN 61175 2005
equipment and industrial products -
Designation of signals
1) 2)
IEC 61666 - Industrial systems, installations and EN 61666 1997
equipment and industrial products -
Identification of terminals within a system

3)
IEC 81346-1 200X Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Basic rules
1)
ISO/IEC 646 - Information technology - ISO 7-bit coded - -
character set for information interchange

1)
Undated reference.
2)
Valid edition at date of issue.
3)
To be published.
IEC 62491
Edition 1.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial systems, installations and equipment and industrial products –
Labelling of cables and cores
Systèmes industriels, installations et appareils et produits industriels –
Etiquetage des câbles et des conducteurs isolés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 01.110; 29.020.20 ISBN 2-8318-9663-0

– 2 – 62491 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Rules.9
4.1 General requirements.9
4.2 Use of designated cable cores.10
4.3 Use of additional labelling .10
5 Identification labelling.11
5.1 General .11
6 Connection labelling .14
6.1 General .14
6.2 Local-end connection labelling .14
6.3 Remote-end connection labelling.15
6.4 Both-end connection labelling.16
7 Signal labelling.17
7.1 General .17
7.2 Labelling by signal designation.17
7.3 Labelling of cables for certain designated conductors.18
8 Composite labelling .19
9 Arrangement of additional labelling.20
9.1 General .20
9.2 Relative positions of the labelling .20
9.3 Characters to be used .20
10 Correspondence between labelling and documentation.21
11 Conformance to this standard.21
Annex A (informative) Examples of labelling .22
Bibliography.30

Figure 1 – Example of identification labelling of a single core cable (W23) and of a
multi-core cable (W24) in which also the different cores are labelled .12
Figure 2 – Example of identification labelling of cores where the initial part of the
reference designation has been partly omitted .13
Figure 3 – Example of local-end connection labelling.14
Figure 4 – Example of remote-end connection labelling for a connection inside a unit.15
Figure 5 – Example of remote-end connection labelling for a cable between different
units .16
Figure 6 – Example of both-end connection labelling .17
Figure 7 – Example of local-end connection labelling combined with signal labelling.19
Figure 8 – Example of composite labelling in which both-end connection labelling is
used together with identification labelling and signal labelling.19
Figure 9 – Examples of arrangements of labelling on cores or cables. .20
Figure A.1 – Circuit diagram used as a basis for the examples .22

62491 © IEC:2008 – 3 –
Figure A.2 – Example of identification labelling .23
Figure A.3 – Example of local-end labelling .24
Figure A.4 – Example of both-end connection labelling .25
Figure A.5 – Example of local end connection labelling with additional information .26
Figure A.6 – Example of signal labelling .27
Figure A.7 – Example of composite labelling.28
Figure A.8 – Example where use is made of the cable colours .29

Table 1 – Example of connection table in which the cable cores are identified by
means of codes for their colour.10
Table 2 – Connection table corresponding to Figure 1 with labelling .12
Table 3 – Connection table corresponding to Figure 2 with labelling .13
Table 4 – Marking of certain designated conductors.18
Table 5 – Methods of labelling defined in this standard .21

– 4 – 62491 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
LABELLING OF CABLES AND CORES
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and
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